Power cables are commonly used in urban underground power grids, interconnecting lines of pilot power plants, internal power supply in industrial and mining enterprises, and underwater power transmission lines across rivers and seas. Their main purpose is to transmit and distribute electrical energy. Power cables are generally manufactured according to specific voltage ratings and are classified into low-voltage power cables, medium-voltage power cables, and high-voltage power cables based on considerations such as construction technology requirements, cable joints, terminal structures, and operational maintenance.
Low-voltage power cables refer to power transmission cables with rated voltages below 1000V and are widely used in residential, commercial, and industrial sectors. Here are several common types of low-voltage power cables:
PVC-insulated cables: Polyvinyl chloride (PVC) insulated cables are a common choice for low-voltage power transmission. They have good insulation performance, durability, and cost-effectiveness, making them suitable for indoor and outdoor low-voltage power distribution.
XLPE-insulated cables: Cross-linked polyethylene (XLPE) insulated cables are also widely used in low-voltage power transmission. They have high insulation performance, heat resistance, and corrosion resistance, making them suitable for long-distance transmission and underground power distribution.
Multi-core cables: Multi-core cables are commonly used for signal transmission and control circuits in low-voltage power systems. They consist of multiple insulated conductors and provide a flexible solution for power wiring.
Medium-voltage power cables refer to power transmission cables with rated voltages between 1kV and 35kV. They are widely used in urban power distribution, industrial power supply, and medium-sized power projects. The selection and application of medium-voltage power cables require consideration of multiple factors, including power system requirements, environmental conditions, and safety requirements. Here are several common types of medium-voltage power cables:
PVC-insulated power cables (PVC cables): PVC cables are a common type of medium-voltage power cable known for their good insulation performance and cost-effectiveness. They are suitable for urban power distribution, industrial power supply, and building power transmission.
XLPE-insulated power cables (XLPE cables): Low voltage XLPE cable is the ideal choice for medium-voltage power transmission. They have high insulation performance, heat resistance, and corrosion resistance, making them suitable for urban grid transmission, industrial power supply, and large-scale power projects.
Insulated conductor power cables: Insulated conductor power cables consist of multiple insulated conductors and are suitable for medium-voltage power distribution systems. They have good flexibility and conductivity, making them suitable for grid transmission and urban distribution.
High-voltage power cables:
High-voltage power cables are used to transmit power with rated voltages ranging from 35kV to 220kV. They are primarily used in industrial sectors, grid transmission, and large-scale power projects. Here are several common types of high-voltage power cables:
XLPE cables: Low voltage XLPE cable is widely used in high-voltage power transmission. They have high insulation performance, heat resistance, and corrosion resistance, making them suitable for long-distance transmission, grid transmission, and underground power distribution.
Oil-impregnated paper-insulated cables: Oil-impregnated paper-insulated cables are traditional high-voltage cables with conductors wrapped in insulating paper. Although they are being gradually replaced, they are still used in certain special cases.
EPR cables: Ethylene propylene rubber (EPR) cables share similar characteristics with XLPE cables and are suitable for high-voltage power transmission and distribution. They exhibit good heat resistance and corrosion resistance.